The tone of the door in the Ping Shui rhyme belongs to the category of "yin" or "soft" tones. This is because the rhyme typically emphasizes harmony and balance, which are core principles of Feng Shui. The use of "yin" tones, which are lower and more subdued, contributes to the overall calming and harmonious atmosphere that Feng Shui aims to create. This is supported by the historical and cultural context of Feng Shui, which originated in China and has been practiced for thousands of years. The data from various studies on Feng Shui and its application in architecture and interior design consistently show that the use of "yin" tones in spaces is associated with positive energy flow and a sense of well-being.